Cooling apparatus



-W.-.E. PRESCOTT. comma APPARATUS.

APPLICATI ON FILED DECJ. I921.

lifi fimg, PatentedAug.22,1922:

WILLIAM EDWARD PRESCOTT, OF LONDON, E1\TGLAND, ASSIGNOR TO JOSEPH BAKER, SONS AND IEERKINS, LIMITED, OF WILLESDEN JUNCTION, LONDON, ENGLAND.

COOLING arranarus.

anemic,

' Specification of Letters Patent.

Application filed December 7, 1921 Serial No. 520,669.

To all whom it may concern: I Be it known-that I, WVILLIAM EDWARD Pnusoorr, of London, England, have invented certain new and useful Improvements in Cooling Apparatus, of which the following is a specification.

This invention relates to apparatus for cooling liquids, semi-liquids and the like, such as sugar syrups and similar substances, particularly for use in the manufacture of confectionery, and also for cooling fats and substances suchas boot polishes, etc.

In the specification of English Letters Patent No. 13602, A. D. 1914;, there is disclosed a structure for evaporating and concentrating liquids under the :action of a fluid heating medium in which the liquid is forced through a spiralpassage of gradually increasing area formed by a spiral plate interposed between two tubes, the outer of which is contained within a steam jacket and the inner of which serves as an outlet for the vapour or steam from the liquid under treatment.

Now the present invention provides an apparatus based on substantially the same principle as the above with, however, certain modifications rendering it particularly suitable for the cooling of liquids, semiliquids and the like as above stated, and in an embodiment of the invention, the spiral passage produced as previously mentioned is adopted, located between inner and outer tubes, the outer of which is enclosed in a jacket for an exterior cooling medium isuch as water circulation.

lhe inner tube is, however, closed at its base and into the same leads a supply also fortcooling medium such as cold water under pressure, the same being suitably admitted by a pipe at the top extending nearly to the base of the tube and circulating under pressure therein in a direction opposite to that of the material under treatment and discharged also at the top. By such a construction the liquid or semi-liquid passing down the spiral plate may be efficiently cooled from both the outside and inside of the passage through which it passes and is discharged at the bottom of said passage as in the specification above referred to or by other appropriate means.

Cooling apparatus as above described may with advantage be used in conjunction with an evaporating or concentrating apparatusas disclosed in the aforesaid speciication in the manufacture of certain confectionery or other goods which first require tobe concentrated and then cooled, the two apparatus being coupled together and the concentrated liquid pumped or otherwise fed'to the top of the cooler after it leaves the bottom of the concentrator. This connection may take the form of a hopper to receive the concentrated liquid and adjacent thereto a pump with pipe connection to the top of the cooler, but may however be so arranged or constructed as to be swung aside when cooling isnot required so that the material from the. concentrator may pass directly to a receiving member such as a table to be dealt with according to will. An embodiment of the inven'tionshown as combined with evaporating or concentrating apparatus of the type previously referred to is illustrated in the accompanyingdrawings in which Fig. 1 is a vertical section of the combined apparatus and Fig. 2 an elevation from the left hand side of Fig. 1 with certain parts removed.

In said drawings A designates theaevaporating or concentrating apparatus constructed substantially in accordance with the invention disclosed in the aforesaid specification No. 13602 A. D. 1914 and comprising an outer casing or jacket a containingtwo tubes a and a shown as slightly tapering in relation to each other, (or may be parallel tubes for some substances) and between which is disposed a helically wound or spiral plate Z), the inner tube a open at the bottom and leading to a vapour outlet to atmosphere at the top at 72 and the outer tube a terminating below in a delivery nozzle b The syrup to be evaporated is assed as from a pump through a pipe 0 to the top 0 of the space between the tubes a and a to the spiral plate I) being pre-heated by passing through a tube cl having inlet 6Z1 and outlet (Z for steam, whilst the jacket a is provided with steam having inlet at e and outlet at 0 a pressure gauge 6 being provided on the outside of the jacket as shown.

To noW turn to the cooling apparatus designated by B this is constructed on very similar lines to the evaporating or concentrating apparatus A and comprises the jacket f containing the two tubes 7 and f between which is disposed the helically wound or spiral plate g. The inner tube f is however closed at the baseas shown at f and a cooling medium as cold water is let in to near the bottom thereof by means of a pipe it this water having outlet at the top at h Cooling medium as cold water is ad mitted to the lower part of the jacket 7 by a pipe z' and after circulating therethrough is drawn off at the top at i I The syrup to be cooled is fed to the top of the spiral plate 9 by a pipe j from any suitable source but in the embodiment shown it is assumed that said syrup has been previouslytreated in the concentrator A and consequently the syrup from delivery nozzle 6 of the concentrator is passed into a pump 0 shown as of the drum type by which it is raised through said pipe y as stated. The

cooledsyrup is delivered from the cooler B through a delivery nozzle f at the base of the outer tube 7. v

What I claim as my invention and desire to secure by Letters Patent of the United States is 1. A cooling apparatus-ofthe character described comprising an outer jacket, two tubes contained within the jacket and having a spiral passage therebetween, the inner of said tubes being closed at its bottom and the outer being spaced from the jacket, means for admitting the substance under treatment to the spiralfpassage, means for admitting a cooling medium to'the space between the jacket and outer tube, and means for admitting a'cooling medium to the inner tube.

2. A coolingapparatus of the character described comprisingan outer jacket, two tubes contained within the jacket and having a spiral passage therebetween, the inner of said tubes being closed at its bottom and the outer of said tubes being spaced from the jacket, means for admitting the sub stance under treatment to the spiral passage, and means for admitting a cooling medium to the space between the jacket and outer tube and to the inner tube and circulating the same in a direction opposite to that of the substance under treatment. 7

In witness whereof I have signed this specification in the presence of two witnesses WILLIAM EDWARB PRESCOTT.

Witnesses:

ARTHUR C. PAOOMBE, REGINALD J. RIDGEWELL. 

